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- W1651176885 abstract "We here consider the pressure equilibrium during an intense magnetic flare above the surface of a cold accretion disk. Under the assumption that the heating source for the plasma trapped within the flaring region is an influx of energy transported inward with a group velocity close to c, e.g., by magnetohydrodynamic waves, this pressure equilibrium can constrain the Thomson optical depth, τT, to be of order unity. We suggest that this may be the reason why τT~1 in Seyfert galaxies. We also consider whether current data can distinguish between the spectrum produced by a single X-ray-emitting region with τT~1 and that formed by many different flares spanning a range of τT. We find that the current observations do not yet have the required energy resolution to permit such a differentiation. Thus, it is possible that the entire X-ray/γ-ray spectrum of Seyfert galaxies is produced by many independent magnetic flares with an optical depth of 0.5<τT<2." @default.
- W1651176885 created "2016-06-24" @default.
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- W1651176885 date "1997-11-20" @default.
- W1651176885 modified "2023-10-02" @default.
- W1651176885 title "Magnetic Flares and the Observed [FORMULA][F]τ[INF][RM]T[/RM][/INF]∼1[/F][/FORMULA] in Seyfert Galaxies" @default.
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- W1651176885 doi "https://doi.org/10.1086/310998" @default.
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